Depends on the vehicle.
For a rodeo I honestly don't know.
But no one else has piped up with a response so here we go anyway.
On my F 250 its down the front near the harmonic balancer!.
On MY Lads ML Triton, its on the rear of clutch housing!
You CAN pick up that info for the ECU from a magnet either on the front of the crank, or at the rear (Flywheel) or indeed - even from the cam shaft!.
Normally if you look in those spots you will pick it up.